It allows to find the optimal value of upslope area in order to extract the river network using r.stream.extract or r.watershed. Real streams depend on rainfall and infiltration rate, i.e. the same topography in different parts of the world yields different real stream networks. This approach provides a best guess about what makes sense when looking only at the DEM.
r.threshold.py acc=accumulation_map
Margherita Di Leo (dileomargherita AT gmail DOT com)
Last changed: (Tue May 24 2011)